The fermentation airlock is made of high quality free polypropylene and the stopper is made of food grade rubber, which is a good and helper for fermentation food. Brewing can be used for conservation, wine making, beer brewing, fermenting sauerkraut, kimchi, which can satisfy your daily fermentation needs. Simply press to press the stop on the balloon, insert the beer airlock into the stop, pour some water into the airlock and cover the lid to perform all the work. Brewing makes it easier for fermentation to effectively isolate the air to prevent oxidation and thus the entire fermentation process is automatic fermentation and exhaust gas without manual control at normal temperature., Manufacturer: Asukohu